For most of history, and in much of the world today, there were no effective police, courts, prisons, or states. People and groups protected themselves according to the law of honor immortalized as the epitaph of the Roman consul Lucius Sulla: No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full. Jocko and Darryl discuss honor and vengeance in societies ancient and modern.